Definition. A metric space is a set X together with a function d (called a metric or distance function) which assigns a real number d (x, y) to every pair x, y X satisfying the properties (or axioms): 1  d (x, y) 0 and d (x, y) = 0 x = y, 2  d (x, y) = d (y, x),
Here are some facts and guidelines about formaldehyde in plywood and OSB that can help you when building a chicken coop: 1  Formaldehyde is used in the binders and resins of some manufactured wood products. 2  Offgassing can be an issue with products containing urea-formaldehyde (UF) resins.
Drury and Larson only had wood tested that was being sold in California. But we wondered if the Chinese-made laminate flooring that Lumber Liquidators is selling nationwide also has high levels of formaldehyde. So we went to stores in Virginia, Florida, Texas, Illinois and New York, and bought 31 boxes of it. We sent the samples for testing at two certified labs.